Prohibits importing German sausages (7)
I believe the answer is:
bangers
'sausages' is the definition.
(banger is a kind of sausage)
'prohibits importing german' is the wordplay.
'prohibits' becomes 'bans' (banning is a kind of prohibiting).
'importing' indicates putting letters inside.
'german' becomes 'ger' (abbreviation).
'bans' enclosing 'ger' is 'BANGERS'.
(Other definitions for bangers that I've seen before include "explosives?" , "Sausages" , "Loud fireworks" , "Crates" .)